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-- Copyright 2006-2020 Mitchell mitchell.att.foicica.com. See License.txt.
-- VisualBasic LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('vb')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match([[
-- Control.
If Then Else ElseIf While Wend For To Each In Step Case Select Return Continue
Do Until Loop Next With Exit
-- Operators.
Mod And Not Or Xor Is
-- Storage types.
Call Class Const Dim ReDim Preserve Function Sub Property End Set Let Get New
Randomize Option Explicit On Error Execute
-- Storage modifiers.
Private Public Default
-- Constants.
Empty False Nothing Null True
]], true)))
-- Types.
lex:add_rule('type', token(lexer.TYPE, word_match([[
Boolean Byte Char Date Decimal Double Long Object Short Single String
]], true)))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT,
lexer.to_eol("'" + word_match([[rem]], true))))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
lex:add_rule('string', token(lexer.STRING, lexer.range('"', true, false)))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number * S('LlUuFf')^-2))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('=><+-*^&:.,_()')))
return lex
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